I thought my head was going to explode after taking that test! 100 questions in 60 minutes.....holy cow the time goes by QUICKLY. The test is no joke and should not be taken lightly. Also, my understanding is they expect you to take it sooner, rather than later after being provided the link. In other words, the timeliness in which you take the test is also counted towards your overall score. So, if you're trying to get an interview at Atlas, start studying now and be ready for the test when the call comes in.....and read the APC thread referenced above. Worst case, you don't get called for an interview, but you learn a bunch of stuff you didn't know before.
Then, if you're successful with the online test, the interview isn't much easier. You're in a conference room w/ a bunch of candidates and one of the first things they said to my group was "look around....you're all in competition with one another....and also from the next few days as well" (I was in the first day of 3 days for the week). They most definitely are not looking to hire everyone they bring to MIA for the interview. To think otherwise is silly....it is very much a competition and they're only going to offer classes or pool to some...not all. My group had a well rounded bunch....some military(one guy was a friggin' U2 pilot.....might as well have been an astronaut), some regional, and some ACMI. So just because you're 'whatever segment of the industry' you're in, don't think you don't have a shot. If you're in MIA for the interview, you have a shot. Just show up, do and be the best you can be, and at the end of the day you have just as much of a chance as the next guy.
The interview, at least for my group, consisted of an HR panel (3 on 1), a tech review (questions that you get wrong from the online test), a resume review (also not to be taken lightly....much more in depth than I expected), and the 1-page essay on a topic unknown until they say "you have 30 minutes to fill the page on XXXX topic. I don't have a ton of experience with airline interviews; but in my opinion, this one was not easy. Every step of the way was a challenge and required a fair amount of preparation and desire to succeed.
My interview experience was good. It was very stressful but after a successful run, even though I passed on the class date, I have a sense of accomplishment in getting that far.
Best of luck to those going through the process or hoping to do so.